Spinosaurus had a body like that of a lean tyrannosaur, a head like that of a titanic crocodile and a sail on its back like that of a mythical dragon! The teeth of this carnivore were also unusual. Unlike most other big meat-eaters, Spinosaurus had straight, conical teeth that indicate it dined mostly on fish! This healthy diet helped Spinosaurus become one of the longest known theropods in dinosaur history.